feat(packaging): systemd unit + D-Bus activation/policy files

debian/authforge-daemon.service

@@ -0,0 +1,25 @@
+[Unit]
+Description=AuthForge MFA daemon
+Documentation=https://github.com/dangerousthings/authforge
+After=dbus.service
+Requires=dbus.service
+
+[Service]
+Type=dbus
+BusName=io.dangerousthings.AuthForge
+ExecStart=/usr/sbin/authforged
+Restart=on-failure
+RestartSec=2
+# Hardening — daemon needs to read /etc/authforge and /var/lib/authforge,
+# write to /etc/pam.d via pam-auth-update, and call libfido2 (USB hid).
+NoNewPrivileges=yes
+ProtectSystem=full
+ProtectHome=read-only
+PrivateTmp=yes
+ProtectKernelTunables=yes
+ProtectKernelModules=yes
+ProtectControlGroups=yes
+ReadWritePaths=/etc/authforge /var/lib/authforge /etc/pam.d /usr/share/pam-configs /etc/u2f_mappings
+
+[Install]
+WantedBy=multi-user.target